Design and analysis of Large Pitch Photonic Crystal Fibers ) LPF PCF (for robust Single Mode operation


Since a Single-Mode (SM) output ensures high beam quality and excellent stability, the SM operation in Large-Mode-Area (LMA) fiber amplifiers and lasers is critical. This paper presents a numerical simulation of single mode operation for Large Pitch Photonic Crystal Fibers. Using COMSOL Multiphysics running with MATLAB, the confinement of the fundamental and higher-order modes in the core of fiber are obtained for different wavelengths, pitch sizes and air-holes diameter. In a certain point of air-holes diameter for different Large Pitch Photonic Crystal Fibers, the avoided crossing between HOMs has been occurred. In this point, the confinement loss of HOMs is increased which is more ensure for SM operation.